The most reasonably priced component used on the Civic 2000 (y) 2dr Si (ka) Interior Light is the Nut,flange,5mm.
Some items from this specific schematic: Bulb,(12v 5w.k), Lens, Light Assy,trunk, Screw Flange 4x12.
With a quantity of two pieces, the Nut,flange,5mm is the most used part in the INTERIOR LIGHT diagram.